Milling bit



FIG. 1 is a perspective view of the ornamental design a milling bit;

FIG. 2 is a first side elevation view thereof;

FIG. 3 is a second side elevation thereof;

FIG. 4 is a third side elevation thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

CLAIM The ornamental design for a milling bit, as shown and described. 